Skip the auto shop - Our mechanics make house calls

Q: Buick not shifting.

asked by on

My Buick will not shift gears.

A: It is highly likely that you have a TH200-4...

It is highly likely that you have a TH200-4R transmission in your Regal. The vacuum line to the modulator and the adjustment of the throttle cable can be checked. These will have the ability to prevent upshifts and downshifts of the transmissions. The valvebody may also be faulty. You may need to enlist the help of a mechanic to check these adjustments. The transmission if still not shifting correctly may need to be removed and rebuilt.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Passenger door won't open

Hello. It is possible that the door actuator is stuck in the lock position, causing the passenger door to jam. It is also possible that there is a problem with the door latch; if the latch won’t release when the...

Q: Acceleration problems when throttle applied

If the engine revs up fine, the problem is in your drivetrain (transmission) Check your transmission fluid and add as necessary and see if that helps. If it is extremely low, a leak may be present. Identify and repair leaks...

Q: Car completely dead.

If your vehicle has sat for some time you may be able to get it started again by simply getting a jump start. If a jump start does not work you can try calling a professional to test your battery....

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...